Left: peak bolometric magnitude plotted against Δm₁₅(bol). Right: bolometric decline rate over 40 days, Δm₄₀(bol), plotted against the decline rate over 15 days, Δm₁₅(bol). We show the angle-averaged light curve values (circles) and 100 different viewing angles (x) for each model. We include Model M2a (Gronow et al. 2020) for comparison. The error bars show the standard deviation of the viewing angle distributions. We also plot the bolometric dataset of Scalzo et al. (2019).